Commit 5d45950d authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

kbuild: move vmlinux.o link to scripts/Makefile.vmlinux_o 



This is a preparation for moving the objtool rule in the next commit.

Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64)
parent b0d6207b

scripts/Makefile.vmlinux_o

0 → 100644
+61 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0-only



PHONY := __default

__default: vmlinux.o



include include/config/auto.conf

include $(srctree)/scripts/Kbuild.include



# Generate a linker script to ensure correct ordering of initcalls for Clang LTO

# ---------------------------------------------------------------------------



quiet_cmd_gen_initcalls_lds = GEN     $@

      cmd_gen_initcalls_lds = \

	$(PYTHON3) $(srctree)/scripts/jobserver-exec \

	$(PERL) $(real-prereqs) > $@



.tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \

		$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE

	$(call if_changed,gen_initcalls_lds)



targets := .tmp_initcalls.lds



ifdef CONFIG_LTO_CLANG

initcalls-lds := .tmp_initcalls.lds

endif



# Link of vmlinux.o used for section mismatch analysis

# ---------------------------------------------------------------------------



quiet_cmd_ld_vmlinux.o = LD      $@

      cmd_ld_vmlinux.o = \

	$(LD) ${KBUILD_LDFLAGS} -r -o $@ \

	$(addprefix -T , $(initcalls-lds)) \

	--whole-archive $(KBUILD_VMLINUX_OBJS) --no-whole-archive \

	--start-group $(KBUILD_VMLINUX_LIBS) --end-group \



define rule_ld_vmlinux.o

	$(call cmd_and_savecmd,ld_vmlinux.o)

endef



vmlinux.o: $(initcalls-lds) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE

	$(call if_changed_rule,ld_vmlinux.o)



targets += vmlinux.o



# Add FORCE to the prequisites of a target to force it to be always rebuilt.

# ---------------------------------------------------------------------------



PHONY += FORCE

FORCE:



# Read all saved command lines and dependencies for the $(targets) we

# may be building above, using $(if_changed{,_dep}). As an

# optimization, we don't need to read them if the target does not

# exist, we will rebuild anyway in that case.



existing-targets := $(wildcard $(sort $(targets)))



-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)



.PHONY: $(PHONY)

scripts/link-vmlinux.sh

+1 −40
Original line number Diff line number Diff line
@@ -45,45 +45,6 @@ info() 
	printf "  %-7s %s\n" "${1}" "${2}"

}



# Generate a linker script to ensure correct ordering of initcalls.

gen_initcalls()

{

	info GEN .tmp_initcalls.lds



	${PYTHON3} ${srctree}/scripts/jobserver-exec		\

	${PERL} ${srctree}/scripts/generate_initcall_order.pl	\

		${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}	\

		> .tmp_initcalls.lds

}



# Link of vmlinux.o used for section mismatch analysis

# ${1} output file

modpost_link()

{

	local objects

	local lds=""



	objects="--whole-archive				\

		${KBUILD_VMLINUX_OBJS}				\

		--no-whole-archive				\

		--start-group					\

		${KBUILD_VMLINUX_LIBS}				\

		--end-group"



	if is_enabled CONFIG_LTO_CLANG; then

		gen_initcalls

		lds="-T .tmp_initcalls.lds"



		# This might take a while, so indicate that we're doing

		# an LTO link

		info LTO ${1}

	else

		info LD ${1}

	fi



	${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${lds} ${objects}

}



objtool_link()

{

	local objtoolcmd;
@@ -336,7 +297,7 @@ fi; 
${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1



#link vmlinux.o

modpost_link vmlinux.o

${MAKE} -f "${srctree}/scripts/Makefile.vmlinux_o"

objtool_link vmlinux.o



# Generate the list of in-tree objects in vmlinux